Oil & Gas Geology ›› 2005, Vol. 26 ›› Issue (3): 349-355.doi: 10.11743/ogg20050314

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Volcanic activities and evolution of source rocks in Xujiaweizi fault depression, Songliao basin

Jin Xiaohui1, Lin Renzi2, Zhou Huayao2, Feng Zihui3, Ren Yanguang3   

  1. 1. Exploration and Production Research Institute, SINOPEC, Beijing;
    2. China University of Petroleum, Beijing;
    3. Daqing Petroleum Exploration and Development Research Institute, Daqing Oilfield Co.Ltd., Daqing, Heilongjiang
  • Received:2005-02-12 Online:2005-06-25 Published:2012-01-16

Abstract:

Xujiaweizi fault depression has experienced three relatively large volcanic activities during rift fauting,among which the volcanic activity duing the deposition of Yingcheng Fm had the longest duration.The volcanic activity speeded up the maturation of the major source rocks including deep Huoshiling Fm,Shahezi Fm and Yingcheng Fm. Simulations of burial history,thermal history and hydrocarbon generation history show that the Ro value of Huoshiling Fm source rocks at a burial depth of 1300m would have rapidly reached 0.7% in about 1Ma.The Ro value of Shahezi and Huoshiling Fins source rocks would have reached 1% at a burial depth of 2600m.Before the deposition of Quantou Fm,Shahezi and Huoshiling Fins source rocks would have entered the peak of gas generation.Before the deposition of Qingshankou Fro,Yingcheng Fin source rocks would have been in the peak of gas generation,while Shahezi and Huoshiling Fms source rocks would have begun to generate dry gas.At this time,the regional seals of the 2ndmember of Denglouku Fm and the 1st and 2nd members of Quantou Fm would have been formed,leading to the formation of gas pools in Yingcheng-Quantou Fms.By the end of the deposition of Nenjiang Fm,the movement of boundary faults led to the redistribution of gas pools in Yingcheng-Quantou Fms.

Key words: source rock, hydrocarbon generation history, natural gas, deep formations in Songliao basin

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